Postman & API Testing Tools

Master Postman and other API testing tools for comprehensive API testing

55 min•By Priygop Team•Last updated: Feb 2026

Postman Features

Request Builder: Create and send HTTP requests
Collections: Organize requests into folders
Environment Variables: Manage different environments
Pre-request Scripts: Set up test data
Test Scripts: Automate API testing
Mock Servers: Create mock APIs for testing
Documentation: Generate API documentation

Postman Test Scripts

Example

// Postman Test Script Examples

// Basic Response Validation
pm.test("Status code is 200", function () {
    pm.response.to.have.status(200);
});

pm.test("Response time is less than 2000ms", function () {
    pm.expect(pm.response.responseTime).to.be.below(2000);
});

pm.test("Response has required fields", function () {
    const jsonData = pm.response.json();
    pm.expect(jsonData).to.have.property('id');
    pm.expect(jsonData).to.have.property('name');
    pm.expect(jsonData).to.have.property('email');
});

// JSON Schema Validation
pm.test("Response matches schema", function () {
    const schema = {
        "type": "object",
        "properties": {
            "id": {"type": "number"},
            "name": {"type": "string"},
            "email": {"type": "string", "format": "email"},
            "status": {"type": "string", "enum": ["active", "inactive"]}
        },
        "required": ["id", "name", "email", "status"]
    };
    
    pm.response.to.have.jsonSchema(schema);
});

// Environment Variables
pm.test("Set user ID for next request", function () {
    const jsonData = pm.response.json();
    pm.environment.set("user_id", jsonData.id);
});

// Dynamic Data Generation
pm.test("Generate test data", function () {
    const randomEmail = pm.variables.replace("{{$randomEmail}}");
    const randomName = pm.variables.replace("{{$randomFullName}}");
    
    pm.environment.set("test_email", randomEmail);
    pm.environment.set("test_name", randomName);
});

// Authentication Token Handling
pm.test("Extract and store auth token", function () {
    const jsonData = pm.response.json();
    pm.environment.set("auth_token", jsonData.token);
});

// Collection Runner Scripts
pm.test("API Performance Test", function () {
    pm.expect(pm.response.responseTime).to.be.below(1000);
    pm.expect(pm.response.code).to.be.oneOf([200, 201]);
});

// Error Handling Tests
pm.test("Handle error responses", function () {
    if (pm.response.code >= 400) {
        const jsonData = pm.response.json();
        pm.expect(jsonData).to.have.property('error');
        pm.expect(jsonData).to.have.property('message');
    }
});